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          LV06-02-内核模块-07-内核模块参数传递
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<details class="folding-tag" blue><summary> 点击查看使用工具及版本 </summary>
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              <table>    <tr>        <td align="center" rowspan="5">PC端开发环境</td>        <td align="center" width=150px>Windows</td>        <td align="left">Windows11</td>    </tr>    <tr>        <td align="center">Ubuntu</td>        <td align="left">Ubuntu20.04.2的64位版本</td>      </tr>    <tr>        <td align="center">VMware® Workstation 17 Pro</td>        <td align="left">17.6.0 build-24238078</td>      </tr>    <tr>        <td align="center">终端软件</td>        <td align="left">MobaXterm(Professional Edition v23.0 Build 5042 (license))</td>    </tr>    <tr>        <td align="center">Win32DiskImager</td>        <td align="left">Win32DiskImager v1.0</td>      </tr>    <tr>        <td align="center" rowspan="3">Linux开发板环境</td>        <td align="center">Linux开发板</td>        <td align="left">正点原子 i.MX6ULL Linux 阿尔法开发板</td>      </tr>    <tr>        <td align="center">uboot</td>        <td align="left">NXP官方提供的uboot，使用的uboot版本为U-Boot 2019.04</td>      </tr>    <tr>        <td align="center">linux内核</td>        <td align="left">linux-4.19.71(NXP官方提供)</td>      </tr></table>
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<details class="folding-tag" blue><summary> 点击查看本文参考资料 </summary>
              <div class='content'>
              <table>    <tr>        <td align="center">分类</td>        <td align="center">网址</td>        <td align="center">说明</td>    </tr>    <tr>        <td align="center" rowspan="5">官方网站</td>        <td align="left"><a href="https://www.arm.com/" target="_blank">https://www.arm.com/</a></td>        <td align="left">ARM官方网站，在这里我们可以找到Cotex-Mx以及ARMVx的一些文档</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxp.com.cn/" target="_blank">https://www.nxp.com.cn/ </a></td>        <td align="left">NXP官方网站</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxpic.org.cn/" target="_blank">https://www.nxpic.org.cn/</a></td><td align="left">NXP 官方社区</td>    </tr>    <tr>        <td align="left"><a href="https://u-boot.readthedocs.io/en/latest/" target="_blank">https://u-boot.readthedocs.io/en/latest/</a></td><td align="left">u-boot官网</td>    </tr>    <tr>        <td align="left"><a href="https://www.kernel.org/" target="_blank">https://www.kernel.org/</a></td><td align="left">linux内核官网</td>    </tr></table>
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            </details>

<details class="folding-tag" blue><summary> 点击查看相关文件下载 </summary>
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              <table>    <tr>        <td align="center">分类</td>        <td align="center">网址</td>        <td align="center">说明</td>    </tr>    <tr>        <td align="center" rowspan="3">NXP</td>        <td align="left"><a href="https://github.com/nxp-imx" target="_blank">https://github.com/nxp-imx</a></td>        <td align="left">NXP imx开发资源GitHub组织，里边会有u-boot和linux内核的仓库</td>    </tr>    <tr>        <td align="left"><a href="https://github.com/nxp-imx/linux-imx/releases/tag/v4.19.71" target="_blank">nxp-imx/linux-imx/releases/tag/v4.19.71</a></td>        <td align="left">NXP linux内核仓库tags中的v4.19.71</td>    </tr>    <tr>        <td align="left"><a href="https://github.com/nxp-imx/uboot-imx/releases/tag/rel_imx_4.19.35_1.1.0" target="_blank">nxp-imx/uboot-imx/releases/tag/rel_imx_4.19.35_1.1.0</a></td>        <td align="left">NXP u-boot仓库tags中的rel_imx_4.19.35_1.1.0</td>    </tr>    <tr>        <td align="center" rowspan="2">I.MX6ULL</td>        <td align="left"><a href="https://www.nxp.com.cn/docs/en/data-sheet/IMX6ULLIEC.pdf" target="_blank">i.MX 6ULL Applications Processors for Industrial Products</a></td>        <td align="left">I.MX6ULL 芯片手册（datasheet，可以在线查看）</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxp.com.cn/webapp/Download?colCode=IMX6ULLRM&lang_cd=zh" target="_blank">i.MX 6ULL Applications ProcessorReference Manual</a></td>        <td align="left">I.MX6ULL 参考手册（下载后才能查看，需要登录NXP官网）</td>    </tr>    <tr>        <td align="center" rowspan="2">Source Code</td>        <td align="left"><a href="https://elixir.bootlin.com/linux/latest/source" target="_blank">https://elixir.bootlin.com/linux/latest/source</a></td>        <td align="left">linux kernel源码</td>    </tr>    <tr>        <td align="left"><a href="https://elixir.bootlin.com/u-boot/latest/source" target="_blank">https://elixir.bootlin.com/u-boot/latest/source</a></td>        <td align="left">uboot源码</td>    </tr></table>
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<p>我们编写C语言函数的时候，函数的传入参数，根据传入参数的不同我们可以实现不同的功能，就连执行main函数的时候也可以传输参数。</p>
<p>内核模块作为一个可拓展的动态模块，为Linux内核提供了灵活性，但是有时我们需要根据不同的应用场景给内核传递不同的参数， 例如在程序中开启调试模式、设置详细输出模式以及制定与具体模块相关的选项，都可以通过参数的形式来改变模块的行为。</p>
<h1 id="一、怎么传递参数？"><a href="#一、怎么传递参数？" class="headerlink" title="一、怎么传递参数？"></a><font size=3>一、怎么传递参数？</font></h1><p>Linux 内核提供了以下几个宏来实现不同类型参数的传递：</p>
<ul>
<li>基本类型：module_param(name, type, perm)</li>
<li>数组参数：module_param_array(name, type, nump, perm)</li>
<li>字符串参数：module_param_string(name, string, len, perm)</li>
</ul>
<h2 id="1-module-param"><a href="#1-module-param" class="headerlink" title="1. module_param"></a><font size=3>1. module_param</font></h2><p>这个宏定义在 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/moduleparam.h#L128">moduleparam.h - include&#x2F;linux&#x2F;moduleparam.h - <em>module_param</em></a> ：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * module_param - typesafe helper for a module/cmdline parameter</span></span><br><span class="line"><span class="comment"> * @value: the variable to alter, and exposed parameter name.</span></span><br><span class="line"><span class="comment"> * @type: the type of the parameter</span></span><br><span class="line"><span class="comment"> * @perm: visibility in sysfs.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * @value becomes the module parameter, or (prefixed by KBUILD_MODNAME and a</span></span><br><span class="line"><span class="comment"> * &quot;.&quot;) the kernel commandline parameter.  Note that - is changed to _, so</span></span><br><span class="line"><span class="comment"> * the user can use &quot;foo-bar=1&quot; even for variable &quot;foo_bar&quot;.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * @perm is 0 if the the variable is not to appear in sysfs, or 0444</span></span><br><span class="line"><span class="comment"> * for world-readable, 0644 for root-writable, etc.  Note that if it</span></span><br><span class="line"><span class="comment"> * is writable, you may need to use kernel_param_lock() around</span></span><br><span class="line"><span class="comment"> * accesses (esp. charp, which can be kfreed when it changes).</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * The @type is simply pasted to refer to a param_ops_##type and a</span></span><br><span class="line"><span class="comment"> * param_check_##type: for convenience many standard types are provided but</span></span><br><span class="line"><span class="comment"> * you can create your own by defining those variables.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * Standard types are:</span></span><br><span class="line"><span class="comment"> *	byte, short, ushort, int, uint, long, ulong</span></span><br><span class="line"><span class="comment"> *	charp: a character pointer</span></span><br><span class="line"><span class="comment"> *	bool: a bool, values 0/1, y/n, Y/N.</span></span><br><span class="line"><span class="comment"> *	invbool: the above, only sense-reversed (N = true).</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> module_param(name, type, perm)				\</span></span><br><span class="line"><span class="meta">	module_param_named(name, name, type, perm)</span></span><br></pre></td></tr></table></figure>

<p>以上代码中的module_param函数需要传入三个参数：</p>
<ul>
<li><p>name： 我们定义的变量名；</p>
</li>
<li><p>type： 参数的类型，目前内核支持的参数类型有byte，short，ushort，int，uint，long，ulong，charp，bool，invbool。其中short表示短整型。ushort 表示无符号短整型 。int表示整型 。uint表示无符号整型。long表示长整型。ulong表示无符号长整型。charp表示的是字符指针。bool是布尔类型，其值只能为0或者是1。invbool是反布尔类型，其值也是只能取0或者是1，但是true值表示0，false表示1。变量是char类型时，传参只能是byte，char * 时只能是charp。</p>
</li>
<li><p>perm： 表示的是该文件的权限，具体参数值见下表。</p>
</li>
</ul>
<table>
    <tr>
        <th>用户组</th>
        <th>标志位</th>
        <th>解释</th>
    </tr>
    <tr>
        <td rowspan="2">当前用户</td>
        <td>S_IRUSR</td>
        <td>用户拥有读权限</td>
    </tr>
    <tr>
        <td>S_IWUSR</td>
        <td>用户拥有写权限</td>
    </tr>
    <tr>
        <td rowspan="2">当前用户组</td>
        <td>S_IRGRP</td>
        <td>当前用户组的其他用户拥有读权限</td>
    </tr>
    <tr>
        <td>S_IWUSR</td>
        <td>当前用户组的其他用户拥有写权限</td>
    </tr>
    <tr>
        <td rowspan="2">其他用户</td>
        <td>S_IROTH</td>
        <td>其他用户拥有读权限</td>
    </tr>
    <tr>
        <td>S_IWOTH</td>
        <td>其他用户拥有写权限</td>
    </tr>
</table>

<p>上述文件权限唯独没有关于可执行权限的设置，请注意， 该文件不允许它具有可执行权限。如果强行给该参数赋予表示可执行权限的参数值S_IXUGO， 那么最终生成的内核模块在加载时会提示错误。其实参数 perm 在 sysfs 文件系统中所对应的文件节点的属性， 其权限定义在“<a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/uapi/linux/stat.h#L29">stat.h - include&#x2F;uapi&#x2F;linux&#x2F;stat.h</a>”文件中。 可以用宏定义和数字法两种方式来表示：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="keyword">define</span> S_IRWXU 00700</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> S_IRUSR 00400 <span class="comment">/*文件所有者可读*/</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> S_IWUSR 00200 <span class="comment">/*文件所有者可写*/</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> S_IXUSR 00100 <span class="comment">/*文件所有者可执行*/</span></span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> S_IRWXG 00070</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> S_IRGRP 00040 <span class="comment">/*与文件所有者同组的用户可读*/</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> S_IWGRP 00020 <span class="comment">/*与文件所有者同组的用户可写*/</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> S_IXGRP 00010 <span class="comment">/*与文件所有者同组的用户可执行*/</span></span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> S_IRWXO 00007</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> S_IROTH 00004 <span class="comment">/*与文件所有者不同组的用户可读*/</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> S_IWOTH 00002 <span class="comment">/*与文件所有者不同组的用户可写*/</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> S_IXOTH 00001 <span class="comment">/*与文件所有者不同组的用户可可执行*/</span></span></span><br></pre></td></tr></table></figure>

<p>还有一些组合的定义在 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/stat.h#L9">stat.h - include&#x2F;linux&#x2F;stat.h</a>：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="keyword">define</span> S_IRWXUGO	(S_IRWXU|S_IRWXG|S_IRWXO)</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> S_IALLUGO	(S_ISUID|S_ISGID|S_ISVTX|S_IRWXUGO)</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> S_IRUGO		(S_IRUSR|S_IRGRP|S_IROTH)</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> S_IWUGO		(S_IWUSR|S_IWGRP|S_IWOTH)</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> S_IXUGO		(S_IXUSR|S_IXGRP|S_IXOTH)</span></span><br></pre></td></tr></table></figure>

<h2 id="2-module-param-array"><a href="#2-module-param-array" class="headerlink" title="2. module_param_array"></a><font size=3>2. module_param_array</font></h2><p>module_param_array定义在<a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/moduleparam.h#L423">moduleparam.h - include&#x2F;linux&#x2F;moduleparam.h - <em>module_param_array</em></a>：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * module_param_array - a parameter which is an array of some type</span></span><br><span class="line"><span class="comment"> * @name: the name of the array variable</span></span><br><span class="line"><span class="comment"> * @type: the type, as per module_param()</span></span><br><span class="line"><span class="comment"> * @nump: optional pointer filled in with the number written</span></span><br><span class="line"><span class="comment"> * @perm: visibility in sysfs</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * Input and output are as comma-separated values.  Commas inside values</span></span><br><span class="line"><span class="comment"> * don&#x27;t work properly (eg. an array of charp).</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * ARRAY_SIZE(@name) is used to determine the number of elements in the</span></span><br><span class="line"><span class="comment"> * array, so the definition must be visible.</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> module_param_array(name, type, nump, perm)		\</span></span><br><span class="line"><span class="meta">	module_param_array_named(name, name, type, nump, perm)</span></span><br></pre></td></tr></table></figure>

<p>可以使用 module_param_array 传递数组类型参数， 相较于 module_param ()函数多了nump 参数， 用来表示传递参数个数，nump参数值会根据输入的参数个数而改变，nump 的最终值为传递的数组元素个数。</p>
<h2 id="3-module-param-string"><a href="#3-module-param-string" class="headerlink" title="3. module_param_string  "></a><font size=3>3. module_param_string  </font></h2><p> module_param_string  用来传递字符串类型的变量 ，它定义在 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/moduleparam.h#L286">moduleparam.h - include&#x2F;linux&#x2F;moduleparam.h - <em>module_param_string</em></a> ：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * module_param_string - a char array parameter</span></span><br><span class="line"><span class="comment"> * @name: the name of the parameter</span></span><br><span class="line"><span class="comment"> * @string: the string variable</span></span><br><span class="line"><span class="comment"> * @len: the maximum length of the string, incl. terminator</span></span><br><span class="line"><span class="comment"> * @perm: visibility in sysfs.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * This actually copies the string when it&#x27;s set (unlike type charp).</span></span><br><span class="line"><span class="comment"> * @len is usually just sizeof(string).</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> module_param_string(name, string, len, perm)			\</span></span><br><span class="line"><span class="meta">	static const struct kparam_string __param_string_##name		\</span></span><br><span class="line"><span class="meta">		= &#123; len, string &#125;;					\</span></span><br><span class="line"><span class="meta">	__module_param_call(MODULE_PARAM_PREFIX, name,			\</span></span><br><span class="line"><span class="meta">			    &amp;param_ops_string,				\</span></span><br><span class="line"><span class="meta">			    .str = &amp;__param_string_##name, perm, -1, 0);\</span></span><br><span class="line"><span class="meta">	__MODULE_PARM_TYPE(name, <span class="string">&quot;string&quot;</span>)</span></span><br></pre></td></tr></table></figure>

<ul>
<li><p>name：外部传入的参数名， 即加载模块时的传入值</p>
</li>
<li><p>string：内部的变量名， 即程序内定义的参数名</p>
</li>
<li><p>len：以 string 命名的 buffer 大小(可以小于 buffer 的大小， 但是没有意义)</p>
</li>
<li><p>perm：模块参数的访问权限 。</p>
</li>
</ul>
<h2 id="4-头文件包含"><a href="#4-头文件包含" class="headerlink" title="4. 头文件包含"></a><font size=3>4. 头文件包含</font></h2><p>上面的几个宏使用的时候需要包含 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/moduleparam.h">moduleparam.h - include&#x2F;linux&#x2F;moduleparam.h</a>文件，但是这个文件在已经在<a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/module.h">module.h - include&#x2F;linux&#x2F;module.h</a>中进行了包含：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="keyword">ifndef</span> _LINUX_MODULE_H</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> _LINUX_MODULE_H</span></span><br><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment"> * Dynamic loading of modules into the kernel.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * Rewritten by Richard Henderson &lt;rth@tamu.edu&gt; Dec 1996</span></span><br><span class="line"><span class="comment"> * Rewritten again by Rusty Russell, 2002</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="comment">// ......</span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/moduleparam.h&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">// ......</span></span><br><span class="line"><span class="meta">#<span class="keyword">endif</span> <span class="comment">/* _LINUX_MODULE_H */</span></span></span><br></pre></td></tr></table></figure>

<h2 id="5-sys-module-模块名-parameters"><a href="#5-sys-module-模块名-parameters" class="headerlink" title="5. &#x2F;sys&#x2F;module&#x2F;模块名&#x2F;parameters"></a><font size=3>5. &#x2F;sys&#x2F;module&#x2F;模块名&#x2F;parameters</font></h2><p>前面我们知道当模块初始化成功的时候会在&#x2F;sys&#x2F;module下新建一个以模块名为名的目录。这里当模块带有参数的时候，会在 <code>/sys/module/模块名</code> 这个目录下创建一个名为 parameters 的目录，里面会显示我们在模块中定义的一些参数名。后面我们实际看一下就明白了。</p>
<h1 id="二、参数传递实例"><a href="#二、参数传递实例" class="headerlink" title="二、参数传递实例"></a><font size=3>二、参数传递实例</font></h1><h2 id="1-代码实例"><a href="#1-代码实例" class="headerlink" title="1. 代码实例"></a><font size=3>1. 代码实例</font></h2><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/kernel.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/init.h&gt;</span>     <span class="comment">/* module_init module_exit */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/module.h&gt;</span>   <span class="comment">/* MODULE_LICENSE */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&quot;./timestamp_autogenerated.h&quot;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&quot;./version_autogenerated.h&quot;</span></span></span><br><span class="line"></span><br><span class="line"><span class="type">static</span> <span class="type">int</span> number;     <span class="comment">// 定义int类型变量number</span></span><br><span class="line"><span class="type">static</span> <span class="type">char</span> *name;     <span class="comment">// 定义char类型变量name</span></span><br><span class="line"><span class="type">static</span> <span class="type">int</span> para[<span class="number">8</span>];    <span class="comment">// 定义int类型的数组</span></span><br><span class="line"><span class="type">static</span> <span class="type">char</span> str1[<span class="number">10</span>];  <span class="comment">// 定义char类型字符串str1</span></span><br><span class="line"><span class="type">static</span> <span class="type">int</span> n_para;     <span class="comment">// 定义int类型的用来记录module_param_array函数传递数组元素个数的变量n_para</span></span><br><span class="line"></span><br><span class="line">module_param(number, <span class="type">int</span>, S_IRUGO); <span class="comment">// 传递int类型的参数number，S_IRUGO表示权限为可读</span></span><br><span class="line">module_param(name, charp, S_IRUGO); <span class="comment">// 传递char类型变量name</span></span><br><span class="line">module_param_array(para , <span class="type">int</span> , &amp;n_para , S_IRUGO);    <span class="comment">// 传递int类型的数组变量para</span></span><br><span class="line">module_param_string(str, str1 ,<span class="keyword">sizeof</span>(str1), S_IRUGO); <span class="comment">// 传递字符串类型的变量str1</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// 模块入口函数</span></span><br><span class="line"><span class="type">static</span> <span class="type">int</span> __init <span class="title function_">module_param_demo_init</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="type">int</span> i = <span class="number">0</span>;</span><br><span class="line">    printk(<span class="string">&quot;*** [%s:%d]Build Time: %s %s, git version:%s ***\n&quot;</span>, __FUNCTION__, __LINE__, KERNEL_KO_DATE, KERNEL_KO_TIME, KERNEL_KO_VERSION);</span><br><span class="line">    printk(<span class="string">&quot;module_param_demo module init!\n&quot;</span>);</span><br><span class="line"></span><br><span class="line">    printk(KERN_EMERG <span class="string">&quot;number=%d\n&quot;</span>,number);</span><br><span class="line">    printk(KERN_EMERG <span class="string">&quot;name=%s\n&quot;</span>,name);                                                                                                                                                          </span><br><span class="line">    <span class="keyword">for</span>(i = <span class="number">0</span>; i &lt; n_para; i++)</span><br><span class="line">    &#123;</span><br><span class="line">        printk(KERN_EMERG <span class="string">&quot;para[%d] : %d \n&quot;</span>, i, para[i]);</span><br><span class="line">    &#125;</span><br><span class="line">    printk(KERN_EMERG <span class="string">&quot;str1=%s\n&quot;</span>,str1);</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 模块出口函数</span></span><br><span class="line"><span class="type">static</span> <span class="type">void</span> __exit <span class="title function_">module_param_demo_exit</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">	printk(<span class="string">&quot;module_param_demo exit!\n&quot;</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 将__init定义的函数指定为驱动的入口函数</span></span><br><span class="line">module_init(module_param_demo_init);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">// 将__exit定义的函数指定为驱动的出口函数</span></span><br><span class="line">module_exit(module_param_demo_exit);</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 模块信息(通过 modinfo module_param_demo 查看) */</span></span><br><span class="line">MODULE_LICENSE(<span class="string">&quot;GPL&quot;</span>);               <span class="comment">/* 源码的许可证协议 */</span></span><br><span class="line">MODULE_AUTHOR(<span class="string">&quot;sumu&quot;</span>);               <span class="comment">/* 字符串常量内容为模块作者说明 */</span></span><br><span class="line">MODULE_DESCRIPTION(<span class="string">&quot;Description&quot;</span>);   <span class="comment">/* 字符串常量内容为模块功能说明 */</span></span><br><span class="line">MODULE_ALIAS(<span class="string">&quot;module&#x27;s other name&quot;</span>); <span class="comment">/* 字符串常量内容为模块别名 */</span></span><br></pre></td></tr></table></figure>



<h2 id="2-开发板测试"><a href="#2-开发板测试" class="headerlink" title="2. 开发板测试"></a><font size=3>2. 开发板测试</font></h2><h3 id="2-1-不传参数"><a href="#2-1-不传参数" class="headerlink" title="2.1 不传参数"></a><font size=3>2.1 不传参数</font></h3><p>我们不传参试一下：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">insmod module_param_demo.ko</span><br></pre></td></tr></table></figure>

<p>会看到如下打印信息：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV06-%E9%A9%B1%E5%8A%A8%E5%BC%80%E5%8F%91/LV06-02-%E5%86%85%E6%A0%B8%E6%A8%A1%E5%9D%97-07-%E5%86%85%E6%A0%B8%E6%A8%A1%E5%9D%97%E5%8F%82%E6%95%B0%E4%BC%A0%E9%80%92/img/image-20241124214858760.png" alt="image-20241124214858760" />

<p>会发现出现了上面提到的报错信息，这个报错就是因为我们给了number_x这个参数可执行权限。另外会看到其他的参数都是0，因为我们并没有传参进来。</p>
<h3 id="2-2-传递参数"><a href="#2-2-传递参数" class="headerlink" title="2.2 传递参数"></a><font size=3>2.2 传递参数</font></h3><p>我们在串口终端敲以下命令：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">insmod module_param_demo.ko number=10 number_x=11 number_0=12 name=&quot;sumu&quot; para=0,1,2,3,4,5,6,7 str=&quot;demo&quot;</span><br></pre></td></tr></table></figure>

<p>我们将会看到以下输出信息：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_"># </span><span class="language-bash">insmod module_param_demo.ko number=10 number_x=11 number_0=12 name=<span class="string">&quot;sumu&quot;</span> para=0,1,2,3,4,5,6,7 str=<span class="string">&quot;demo&quot;</span></span></span><br><span class="line">[  220.278258] ------------[ cut here ]------------</span><br><span class="line">[  220.283281] WARNING: CPU: 0 PID: 167 at fs/sysfs/group.c:60 internal_create_group+0x324/0x398</span><br><span class="line">[  220.291995] Attribute number_x: Invalid permissions 0111</span><br><span class="line">[  220.297346] Modules linked in: module_param_demo(PO+) [last unloaded: module_param_demo]</span><br><span class="line">[  220.305603] CPU: 0 PID: 167 Comm: insmod Tainted: P        W  O      4.19.71-00007-g51f3cd8ec-dirty #9</span><br><span class="line">[  220.314936] Hardware name: Freescale i.MX6 Ultralite (Device Tree)</span><br><span class="line">[  220.321139] Backtrace:</span><br><span class="line">[  220.323639] [&lt;c010e590&gt;] (dump_backtrace) from [&lt;c010e918&gt;] (show_stack+0x18/0x1c)</span><br><span class="line">[  220.331242]  r7:00000000 r6:600f0013 r5:00000000 r4:c11cf698</span><br><span class="line">[  220.336939] [&lt;c010e900&gt;] (show_stack) from [&lt;c0b75e74&gt;] (dump_stack+0xdc/0x114)</span><br><span class="line">[  220.344289] [&lt;c0b75d98&gt;] (dump_stack) from [&lt;c0128b9c&gt;] (__warn.part.3+0xb0/0xf0)</span><br><span class="line">[  220.351805]  r10:00000003 r9:00000049 r8:00000000 r7:0000003c r6:00000009 r5:00000000</span><br><span class="line">[  220.359660]  r4:d8a31d7c r3:c15097ad</span><br><span class="line">[  220.363274] [&lt;c0128aec&gt;] (__warn.part.3) from [&lt;c0128c40&gt;] (warn_slowpath_fmt+0x64/0x88)</span><br><span class="line">[  220.371394]  r7:c031643c r6:0000003c r5:c0e7e010 r4:c1108908</span><br><span class="line">[  220.377092] [&lt;c0128be0&gt;] (warn_slowpath_fmt) from [&lt;c031643c&gt;] (internal_create_group+0x324/0x398)</span><br><span class="line">[  220.386076]  r3:bf009090 r2:c0e7e054</span><br><span class="line">[  220.389681]  r7:bf00a048 r6:d8ba7a4c r5:d8c058c0 r4:d8ab2504</span><br><span class="line">[  220.395375] [&lt;c0316118&gt;] (internal_create_group) from [&lt;c03164c8&gt;] (sysfs_create_group+0x18/0x1c)</span><br><span class="line">[  220.404282]  r10:c1108908 r9:00000000 r8:bf00a048 r7:00000006 r6:bf00a048 r5:00000006</span><br><span class="line">[  220.412135]  r4:bf009208</span><br><span class="line">[  220.414705] [&lt;c03164b0&gt;] (sysfs_create_group) from [&lt;c014ef44&gt;] (module_param_sysfs_setup+0x7c/0xb8)</span><br><span class="line">[  220.423873] [&lt;c014eec8&gt;] (module_param_sysfs_setup) from [&lt;c01d3cf8&gt;] (load_module+0x1ba4/0x2594)</span><br><span class="line">[  220.432779]  r9:d8a31f30 r8:00000006 r7:bf00a000 r6:c11dd480 r5:00000000 r4:bf00a048</span><br><span class="line">[  220.440556] [&lt;c01d2154&gt;] (load_module) from [&lt;c01d494c&gt;] (sys_finit_module+0xc4/0xe4)</span><br><span class="line">[  220.448421]  r10:0000017b r9:00000000 r8:7fffffff r7:00000003 r6:022b6150 r5:00000000</span><br><span class="line">[  220.456273]  r4:c1108908</span><br><span class="line">[  220.458842] [&lt;c01d4888&gt;] (sys_finit_module) from [&lt;c0101000&gt;] (ret_fast_syscall+0x0/0x28)</span><br><span class="line">[  220.467044] Exception stack(0xd8a31fa8 to 0xd8a31ff0)</span><br><span class="line">[  220.472129] 1fa0:                   41ff0200 bea69ef5 00000003 022b6150 00000000 bea69ef5</span><br><span class="line">[  220.480340] 1fc0: 41ff0200 bea69ef5 bea69de4 0000017b 00000003 00000000 004e79b8 00000000</span><br><span class="line">[  220.488545] 1fe0: bea69c40 bea69c30 0042ecac b6eba1b0</span><br><span class="line">[  220.493630]  r9:d8a30000 r8:c01011e4 r7:0000017b r6:bea69de4 r5:bea69ef5 r4:41ff0200</span><br><span class="line">[  220.501518] irq event stamp: 0</span><br><span class="line">[  220.504623] hardirqs last  enabled at (0): [&lt;00000000&gt;]   (null)</span><br><span class="line">[  220.510675] hardirqs last disabled at (0): [&lt;c0125c54&gt;] copy_process.part.3+0x2e4/0x1a84</span><br><span class="line">[  220.518868] softirqs last  enabled at (0): [&lt;c0125c54&gt;] copy_process.part.3+0x2e4/0x1a84</span><br><span class="line">[  220.527046] softirqs last disabled at (0): [&lt;00000000&gt;]   (null)</span><br><span class="line">[  220.533141] ---[ end trace d31065e9ec5213ff ]---</span><br><span class="line">[  220.548768] *** [module_param_demo_init:26]Build Time: Nov 24 2024 21:45:23, git version:15c3f15 ***</span><br><span class="line">[  220.558118] module_param_demo module init!</span><br><span class="line">[  220.562327] number=10</span><br><span class="line">[  220.564622] number_x=11</span><br><span class="line">[  220.567085] number_0=12</span><br><span class="line">[  220.569549] name=sumu</span><br><span class="line">[  220.571931] para[0] : 0</span><br><span class="line">[  220.574486] para[1] : 1</span><br><span class="line">[  220.577037] para[2] : 2</span><br><span class="line">[  220.579588] para[3] : 3</span><br><span class="line">[  220.582192] para[4] : 4</span><br><span class="line">[  220.584747] para[5] : 5</span><br><span class="line">[  220.587298] para[6] : 6</span><br><span class="line">[  220.589849] para[7] : 7</span><br><span class="line">[  220.592442] str1=demo</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<p>有和前面一样的报错信息，但是最下面每个参数的值都发生了变化，和我们前面传递的参数都是对应的：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_"># </span><span class="language-bash">insmod module_param_demo.ko number=10 number_x=11 number_0=12 name=<span class="string">&quot;sumu&quot;</span> para=0,1,2,3,4,5,6,7 str=<span class="string">&quot;demo&quot;</span></span></span><br><span class="line"></span><br></pre></td></tr></table></figure>

<h3 id="2-3-sys-module-模块名-parameters"><a href="#2-3-sys-module-模块名-parameters" class="headerlink" title="2.3 &#x2F;sys&#x2F;module&#x2F;模块名&#x2F;parameters"></a><font size=3>2.3 &#x2F;sys&#x2F;module&#x2F;模块名&#x2F;parameters</font></h3><p>不管我们有没有传递参数进去，我这里是以传递参数的加载方式为例，我们看一下 &#x2F;sys&#x2F;module&#x2F;模块名：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV06-%E9%A9%B1%E5%8A%A8%E5%BC%80%E5%8F%91/LV06-02-%E5%86%85%E6%A0%B8%E6%A8%A1%E5%9D%97-07-%E5%86%85%E6%A0%B8%E6%A8%A1%E5%9D%97%E5%8F%82%E6%95%B0%E4%BC%A0%E9%80%92/img/image-20241124213250840.png" alt="image-20241124213250840" />

<p>会发现这个目录下还有很多目录，包括我们要看的 parameters 目录，我们看一下这个目录下都有什么：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV06-%E9%A9%B1%E5%8A%A8%E5%BC%80%E5%8F%91/LV06-02-%E5%86%85%E6%A0%B8%E6%A8%A1%E5%9D%97-07-%E5%86%85%E6%A0%B8%E6%A8%A1%E5%9D%97%E5%8F%82%E6%95%B0%E4%BC%A0%E9%80%92/img/image-20241124215301520.png" alt="image-20241124215301520" />

<p>会发现，这不就是我们前面定义的几个内核模块参数嘛。不过这里会发现少了一个，少了number_0这个参数，因为我们前面给的权限是0，所以这里没有权限查看这个参数，这里也就不会显示。</p>

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